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Monday 12.4. 09: 3 0: Physics fill for the day 17:30: Loss of cryo maintain P roblem with the temperature reading of the current lead for RQTL9.67 ( L7). A rtificial jump in temperature (immediately passing from 50 to 100 K ), which lasted for a few seconds.

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Monday 12 4
Monday 12.4.

  • 09:30: Physics fill for the day

  • 17:30: Loss of cryo maintain

    • Problem with the temperature reading of the current lead for RQTL9.67 (L7). Artificial jump in temperature (immediately passing from 50 to 100 K), which lasted for a few seconds.

    • Reading shows similar perturbations about every 3 hours with different amplitudes.

    • Problem no yet understood but temporarily ‘solved’ by filtering the reading.

  • 19:00: Request by CMS to have access in cavern for investigating water leak

    • intervention lasted longer than foreseen (over one hour compared to 20min).

    • ALICE also had access in shadow of CMS.


Monday 12 41
Monday 12.4.

  • 19:00: Trip of 3 RF modules for Beam 2. OK after reset.

  • 20:50: BIS problem related to RF for Beam2.

    • Latched interlock coming from a short loss of cryo OK.

  • 21:40: SIS problem related to QPSstate of RQX.L8

    • QPS expert confirms QPS of RQX.L8 is OK. Proceed by masking signal for injection and taking shots for beam setup with low intensities.

  • 22:10:XPOC problem with LBDS after dumping pilot beams

    • Missing BCT data.

  • 22:45: Problem related to orbit correction.

  • 23:20: Again XPOCproblem with LBDS after dumping pilot beams.

  • 23:30: Filling in a few injections for bunch length calibration.

  • 00:15: Problems with loading the ramp settings.

    • apparently caused by adjustments during orbit corrections via trims.


Monday 12 42
Monday 12.4.

  • Problem related to orbit correction:

    • MCBV.12L4.B1 = 14.54 mrad

    •  MCBV.16L4.B1and MCBV.8L4.B1 = -7.5 mrad


Monday 12 43
Monday 12.4.

  • 02:00: Ramp settings OK

  • 02:30: CPOC problem again

  • 03:00: Beams circulating and ready for ramp.

  • 04:00: Ramp finished.

  • 05:00: Stable beams.


13.4.

  • Plan for the morning:

    • Squeeze in IR1 & IR5.

    • Squeeze in IR8.

    • Establishment of corrected orbit reference followed by re-adjustment of tertiary collimators.

    • Measurement of loss hierarchy.

    • Simulation of asynchronous beam dump.

  • Afternoon:

    • Damper studies at 450 GeV.

  • Night:

    • Physics fill with squeezed optics.

  • Wednesday:

    • Continuation with preparations for higher beam intensities.


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